drivers/gpu/drm/msm/msm_fb.c - third_party/linux - Git at Google

 /*
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>

 #include "msm_drv.h"
 #include "msm_kms.h"
 #include "msm_gem.h"

 struct msm_framebuffer {
 	struct drm_framebuffer base;
 	const struct msm_format *format;
 	struct drm_gem_object *planes[MAX_PLANE];
 };
 #define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)

 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos);

 static int msm_framebuffer_create_handle(struct drm_framebuffer *fb,
 		struct drm_file *file_priv,
 		unsigned int *handle)
 {
 	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 	return drm_gem_handle_create(file_priv,
 			msm_fb->planes[0], handle);
 }

 static void msm_framebuffer_destroy(struct drm_framebuffer *fb)
 {
 	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 	int i, n = fb->format->num_planes;

 	DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);

 	drm_framebuffer_cleanup(fb);

 	for (i = 0; i < n; i++) {
 		struct drm_gem_object *bo = msm_fb->planes[i];

 		drm_gem_object_put_unlocked(bo);
 	}

 	kfree(msm_fb);
 }

 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
 	.create_handle = msm_framebuffer_create_handle,
 	.destroy = msm_framebuffer_destroy,
 };

 #ifdef CONFIG_DEBUG_FS
 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
 {
 	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 	int i, n = fb->format->num_planes;

 	seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
 			fb->width, fb->height, (char *)&fb->format->format,
 			drm_framebuffer_read_refcount(fb), fb->base.id);

 	for (i = 0; i < n; i++) {
 		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
 				i, fb->offsets[i], fb->pitches[i]);
 		msm_gem_describe(msm_fb->planes[i], m);
 	}
 }
 #endif

 /* prepare/pin all the fb's bo's for scanout.  Note that it is not valid
  * to prepare an fb more multiple different initiator 'id's.  But that
  * should be fine, since only the scanout (mdpN) side of things needs
  * this, the gpu doesn't care about fb's.
  */
 int msm_framebuffer_prepare(struct drm_framebuffer *fb,
 		struct msm_gem_address_space *aspace)
 {
 	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 	int ret, i, n = fb->format->num_planes;
 	uint64_t iova;

 	for (i = 0; i < n; i++) {
 		ret = msm_gem_get_iova(msm_fb->planes[i], aspace, &iova);
 		DBG("FB[%u]: iova[%d]: %08llx (%d)", fb->base.id, i, iova, ret);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
 		struct msm_gem_address_space *aspace)
 {
 	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 	int i, n = fb->format->num_planes;

 	for (i = 0; i < n; i++)
 		msm_gem_put_iova(msm_fb->planes[i], aspace);
 }

 uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
 		struct msm_gem_address_space *aspace, int plane)
 {
 	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 	if (!msm_fb->planes[plane])
 		return 0;
 	return msm_gem_iova(msm_fb->planes[plane], aspace) + fb->offsets[plane];
 }

 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
 {
 	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 	return msm_fb->planes[plane];
 }

 const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
 {
 	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 	return msm_fb->format;
 }

 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 		struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 {
 	struct drm_gem_object *bos[4] = {0};
 	struct drm_framebuffer *fb;
 	int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);

 	for (i = 0; i < n; i++) {
 		bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
 		if (!bos[i]) {
 			ret = -ENXIO;
 			goto out_unref;
 		}
 	}

 	fb = msm_framebuffer_init(dev, mode_cmd, bos);
 	if (IS_ERR(fb)) {
 		ret = PTR_ERR(fb);
 		goto out_unref;
 	}

 	return fb;

 out_unref:
 	for (i = 0; i < n; i++)
 		drm_gem_object_put_unlocked(bos[i]);
 	return ERR_PTR(ret);
 }

 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
 	struct msm_framebuffer *msm_fb = NULL;
 	struct drm_framebuffer *fb;
 	const struct msm_format *format;
 	int ret, i, n;
 	unsigned int hsub, vsub;

 	DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 			dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 			(char *)&mode_cmd->pixel_format);

 	n = drm_format_num_planes(mode_cmd->pixel_format);
 	hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
 	vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);

 	format = kms->funcs->get_format(kms, mode_cmd->pixel_format,
 			mode_cmd->modifier[0]);
 	if (!format) {
 		dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
 				(char *)&mode_cmd->pixel_format);
 		ret = -EINVAL;
 		goto fail;
 	}

 	msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
 	if (!msm_fb) {
 		ret = -ENOMEM;
 		goto fail;
 	}

 	fb = &msm_fb->base;

 	msm_fb->format = format;

 	if (n > ARRAY_SIZE(msm_fb->planes)) {
 		ret = -EINVAL;
 		goto fail;
 	}

 	for (i = 0; i < n; i++) {
 		unsigned int width = mode_cmd->width / (i ? hsub : 1);
 		unsigned int height = mode_cmd->height / (i ? vsub : 1);
 		unsigned int min_size;

 		min_size = (height - 1) * mode_cmd->pitches[i]
 			 + width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
 			 + mode_cmd->offsets[i];

 		if (bos[i]->size < min_size) {
 			ret = -EINVAL;
 			goto fail;
 		}

 		msm_fb->planes[i] = bos[i];
 	}

 	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);

 	ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
 	if (ret) {
 		dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 		goto fail;
 	}

 	DBG("create: FB ID: %d (%p)", fb->base.id, fb);

 	return fb;

 fail:
 	kfree(msm_fb);

 	return ERR_PTR(ret);
 }

 struct drm_framebuffer *
 msm_alloc_stolen_fb(struct drm_device *dev, int w, int h, int p, uint32_t format)
 {
 	struct drm_mode_fb_cmd2 mode_cmd = {
 		.pixel_format = format,
 		.width = w,
 		.height = h,
 		.pitches = { p },
 	};
 	struct drm_gem_object *bo;
 	struct drm_framebuffer *fb;
 	int size;

 	/* allocate backing bo */
 	size = mode_cmd.pitches[0] * mode_cmd.height;
 	DBG("allocating %d bytes for fb %d", size, dev->primary->index);
 	bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN);
 	if (IS_ERR(bo)) {
 		dev_warn(dev->dev, "could not allocate stolen bo\n");
 		/* try regular bo: */
 		bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
 	}
 	if (IS_ERR(bo)) {
 		dev_err(dev->dev, "failed to allocate buffer object\n");
 		return ERR_CAST(bo);
 	}

 	fb = msm_framebuffer_init(dev, &mode_cmd, &bo);
 	if (IS_ERR(fb)) {
 		dev_err(dev->dev, "failed to allocate fb\n");
 		/* note: if fb creation failed, we can't rely on fb destroy
 		 * to unref the bo:
 		 */
 		drm_gem_object_put_unlocked(bo);
 		return ERR_CAST(fb);
 	}

 	return fb;
 }
	/*
	* Copyright (C) 2013 Red Hat
	* Author: Rob Clark <robdclark@gmail.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published by
	* the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <drm/drm_crtc.h>
	#include <drm/drm_crtc_helper.h>

	#include "msm_drv.h"
	#include "msm_kms.h"
	#include "msm_gem.h"

	struct msm_framebuffer {
	struct drm_framebuffer base;
	const struct msm_format *format;
	struct drm_gem_object *planes[MAX_PLANE];
	};
	#define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)

	static struct drm_framebuffer msm_framebuffer_init(struct drm_device dev,
	const struct drm_mode_fb_cmd2 mode_cmd, struct drm_gem_object *bos);

	static int msm_framebuffer_create_handle(struct drm_framebuffer *fb,
	struct drm_file *file_priv,
	unsigned int *handle)
	{
	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
	return drm_gem_handle_create(file_priv,
	msm_fb->planes[0], handle);
	}

	static void msm_framebuffer_destroy(struct drm_framebuffer *fb)
	{
	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
	int i, n = fb->format->num_planes;

	DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);

	drm_framebuffer_cleanup(fb);

	for (i = 0; i < n; i++) {
	struct drm_gem_object *bo = msm_fb->planes[i];

	drm_gem_object_put_unlocked(bo);
	}

	kfree(msm_fb);
	}

	static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
	.create_handle = msm_framebuffer_create_handle,
	.destroy = msm_framebuffer_destroy,
	};

	#ifdef CONFIG_DEBUG_FS
	void msm_framebuffer_describe(struct drm_framebuffer fb, struct seq_file m)
	{
	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
	int i, n = fb->format->num_planes;

	seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
	fb->width, fb->height, (char *)&fb->format->format,
	drm_framebuffer_read_refcount(fb), fb->base.id);

	for (i = 0; i < n; i++) {
	seq_printf(m, " %d: offset=%d pitch=%d, obj: ",
	i, fb->offsets[i], fb->pitches[i]);
	msm_gem_describe(msm_fb->planes[i], m);
	}
	}
	#endif

	/* prepare/pin all the fb's bo's for scanout. Note that it is not valid
	* to prepare an fb more multiple different initiator 'id's. But that
	* should be fine, since only the scanout (mdpN) side of things needs
	* this, the gpu doesn't care about fb's.
	*/
	int msm_framebuffer_prepare(struct drm_framebuffer *fb,
	struct msm_gem_address_space *aspace)
	{
	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
	int ret, i, n = fb->format->num_planes;
	uint64_t iova;

	for (i = 0; i < n; i++) {
	ret = msm_gem_get_iova(msm_fb->planes[i], aspace, &iova);
	DBG("FB[%u]: iova[%d]: %08llx (%d)", fb->base.id, i, iova, ret);
	if (ret)
	return ret;
	}

	return 0;
	}

	void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
	struct msm_gem_address_space *aspace)
	{
	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
	int i, n = fb->format->num_planes;

	for (i = 0; i < n; i++)
	msm_gem_put_iova(msm_fb->planes[i], aspace);
	}

	uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
	struct msm_gem_address_space *aspace, int plane)
	{
	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
	if (!msm_fb->planes[plane])
	return 0;
	return msm_gem_iova(msm_fb->planes[plane], aspace) + fb->offsets[plane];
	}

	struct drm_gem_object msm_framebuffer_bo(struct drm_framebuffer fb, int plane)
	{
	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
	return msm_fb->planes[plane];
	}

	const struct msm_format msm_framebuffer_format(struct drm_framebuffer fb)
	{
	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
	return msm_fb->format;
	}

	struct drm_framebuffer msm_framebuffer_create(struct drm_device dev,
	struct drm_file file, const struct drm_mode_fb_cmd2 mode_cmd)
	{
	struct drm_gem_object *bos[4] = {0};
	struct drm_framebuffer *fb;
	int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);

	for (i = 0; i < n; i++) {
	bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
	if (!bos[i]) {
	ret = -ENXIO;
	goto out_unref;
	}
	}

	fb = msm_framebuffer_init(dev, mode_cmd, bos);
	if (IS_ERR(fb)) {
	ret = PTR_ERR(fb);
	goto out_unref;
	}

	return fb;

	out_unref:
	for (i = 0; i < n; i++)
	drm_gem_object_put_unlocked(bos[i]);
	return ERR_PTR(ret);
	}

	static struct drm_framebuffer msm_framebuffer_init(struct drm_device dev,
	const struct drm_mode_fb_cmd2 mode_cmd, struct drm_gem_object *bos)
	{
	struct msm_drm_private *priv = dev->dev_private;
	struct msm_kms *kms = priv->kms;
	struct msm_framebuffer *msm_fb = NULL;
	struct drm_framebuffer *fb;
	const struct msm_format *format;
	int ret, i, n;
	unsigned int hsub, vsub;

	DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
	dev, mode_cmd, mode_cmd->width, mode_cmd->height,
	(char *)&mode_cmd->pixel_format);

	n = drm_format_num_planes(mode_cmd->pixel_format);
	hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
	vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);

	format = kms->funcs->get_format(kms, mode_cmd->pixel_format,
	mode_cmd->modifier[0]);
	if (!format) {
	dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
	(char *)&mode_cmd->pixel_format);
	ret = -EINVAL;
	goto fail;
	}

	msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
	if (!msm_fb) {
	ret = -ENOMEM;
	goto fail;
	}

	fb = &msm_fb->base;

	msm_fb->format = format;

	if (n > ARRAY_SIZE(msm_fb->planes)) {
	ret = -EINVAL;
	goto fail;
	}

	for (i = 0; i < n; i++) {
	unsigned int width = mode_cmd->width / (i ? hsub : 1);
	unsigned int height = mode_cmd->height / (i ? vsub : 1);
	unsigned int min_size;

	min_size = (height - 1) * mode_cmd->pitches[i]
	+ width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
	+ mode_cmd->offsets[i];

	if (bos[i]->size < min_size) {
	ret = -EINVAL;
	goto fail;
	}

	msm_fb->planes[i] = bos[i];
	}

	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);

	ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
	if (ret) {
	dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
	goto fail;
	}

	DBG("create: FB ID: %d (%p)", fb->base.id, fb);

	return fb;

	fail:
	kfree(msm_fb);

	return ERR_PTR(ret);
	}

	struct drm_framebuffer *
	msm_alloc_stolen_fb(struct drm_device *dev, int w, int h, int p, uint32_t format)
	{
	struct drm_mode_fb_cmd2 mode_cmd = {
	.pixel_format = format,
	.width = w,
	.height = h,
	.pitches = { p },
	};
	struct drm_gem_object *bo;
	struct drm_framebuffer *fb;
	int size;

	/* allocate backing bo */
	size = mode_cmd.pitches[0] * mode_cmd.height;
	DBG("allocating %d bytes for fb %d", size, dev->primary->index);
	bo = msm_gem_new(dev, size, MSM_BO_SCANOUT \| MSM_BO_WC \| MSM_BO_STOLEN);
	if (IS_ERR(bo)) {
	dev_warn(dev->dev, "could not allocate stolen bo\n");
	/* try regular bo: */
	bo = msm_gem_new(dev, size, MSM_BO_SCANOUT \| MSM_BO_WC);
	}
	if (IS_ERR(bo)) {
	dev_err(dev->dev, "failed to allocate buffer object\n");
	return ERR_CAST(bo);
	}

	fb = msm_framebuffer_init(dev, &mode_cmd, &bo);
	if (IS_ERR(fb)) {
	dev_err(dev->dev, "failed to allocate fb\n");
	/* note: if fb creation failed, we can't rely on fb destroy
	* to unref the bo:
	*/
	drm_gem_object_put_unlocked(bo);
	return ERR_CAST(fb);
	}

	return fb;
	}